From 7b306895afbbe75977e1c12e4964f0a2b6d1d672 Mon Sep 17 00:00:00 2001
From: Victor Wei <vw1262@gmail.com>
Date: Wed, 27 Jul 2022 10:25:05 -0500
Subject: [PATCH 1/7] expr_ty to grab expression type

---
 lints/sysvar_address_check/.cargo/config.toml |   11 +
 lints/sysvar_address_check/.gitignore         |    1 +
 lints/sysvar_address_check/Cargo.lock         | 1911 +++++++++++++++++
 lints/sysvar_address_check/Cargo.toml         |   33 +
 lints/sysvar_address_check/README.md          |   19 +
 lints/sysvar_address_check/rust-toolchain     |    3 +
 lints/sysvar_address_check/src/lib.rs         |  142 ++
 lints/sysvar_address_check/src/paths.rs       |    1 +
 .../ui/insecure-2/Cargo.lock                  | 1408 ++++++++++++
 .../ui/insecure-2/Cargo.toml                  |   25 +
 .../ui/insecure-2/Xargo.toml                  |    2 +
 .../ui/insecure-2/src/lib.rs                  |   21 +
 .../ui/insecure/Cargo.toml                    |   22 +
 .../ui/insecure/Xargo.toml                    |    2 +
 .../ui/insecure/src/lib.rs                    |   18 +
 .../ui/recommended/Cargo.toml                 |   22 +
 .../ui/recommended/Xargo.toml                 |    2 +
 .../ui/recommended/src/lib.rs                 |   18 +
 .../sysvar_address_check/ui/secure/Cargo.toml |   19 +
 .../sysvar_address_check/ui/secure/Xargo.toml |    2 +
 .../sysvar_address_check/ui/secure/src/lib.rs |   19 +
 21 files changed, 3701 insertions(+)
 create mode 100644 lints/sysvar_address_check/.cargo/config.toml
 create mode 100644 lints/sysvar_address_check/.gitignore
 create mode 100644 lints/sysvar_address_check/Cargo.lock
 create mode 100644 lints/sysvar_address_check/Cargo.toml
 create mode 100644 lints/sysvar_address_check/README.md
 create mode 100644 lints/sysvar_address_check/rust-toolchain
 create mode 100644 lints/sysvar_address_check/src/lib.rs
 create mode 100644 lints/sysvar_address_check/src/paths.rs
 create mode 100644 lints/sysvar_address_check/ui/insecure-2/Cargo.lock
 create mode 100644 lints/sysvar_address_check/ui/insecure-2/Cargo.toml
 create mode 100644 lints/sysvar_address_check/ui/insecure-2/Xargo.toml
 create mode 100644 lints/sysvar_address_check/ui/insecure-2/src/lib.rs
 create mode 100644 lints/sysvar_address_check/ui/insecure/Cargo.toml
 create mode 100644 lints/sysvar_address_check/ui/insecure/Xargo.toml
 create mode 100644 lints/sysvar_address_check/ui/insecure/src/lib.rs
 create mode 100644 lints/sysvar_address_check/ui/recommended/Cargo.toml
 create mode 100644 lints/sysvar_address_check/ui/recommended/Xargo.toml
 create mode 100644 lints/sysvar_address_check/ui/recommended/src/lib.rs
 create mode 100644 lints/sysvar_address_check/ui/secure/Cargo.toml
 create mode 100644 lints/sysvar_address_check/ui/secure/Xargo.toml
 create mode 100644 lints/sysvar_address_check/ui/secure/src/lib.rs

diff --git a/lints/sysvar_address_check/.cargo/config.toml b/lints/sysvar_address_check/.cargo/config.toml
new file mode 100644
index 0000000..46d1571
--- /dev/null
+++ b/lints/sysvar_address_check/.cargo/config.toml
@@ -0,0 +1,11 @@
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diff --git a/lints/sysvar_address_check/.gitignore b/lints/sysvar_address_check/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/lints/sysvar_address_check/.gitignore
@@ -0,0 +1 @@
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diff --git a/lints/sysvar_address_check/Cargo.lock b/lints/sysvar_address_check/Cargo.lock
new file mode 100644
index 0000000..821c58c
--- /dev/null
+++ b/lints/sysvar_address_check/Cargo.lock
@@ -0,0 +1,1911 @@
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diff --git a/lints/sysvar_address_check/Cargo.toml b/lints/sysvar_address_check/Cargo.toml
new file mode 100644
index 0000000..ccacc6a
--- /dev/null
+++ b/lints/sysvar_address_check/Cargo.toml
@@ -0,0 +1,33 @@
+[package]
+name = "sysvar_address_check"
+version = "0.1.0"
+authors = ["authors go here"]
+description = "description goes here"
+edition = "2018"
+publish = false
+
+[lib]
+crate-type = ["cdylib"]
+
+[[example]]
+name = "insecure"
+path = "ui/insecure/src/lib.rs"
+
+[[example]]
+name = "insecure-2"
+path = "ui/insecure-2/src/lib.rs"
+
+[dependencies]
+clippy_utils = { git = "https://github.com/rust-lang/rust-clippy", rev = "0cb0f7636851f9fcc57085cf80197a2ef6db098f" }
+dylint_linting = "2.0.7"
+if_chain = "1.0.2"
+
+[dev-dependencies]
+anchor-lang = "0.25.0"
+bincode = "1.3.3"
+dylint_testing = "2.0.7"
+
+[workspace]
+
+[package.metadata.rust-analyzer]
+rustc_private = true
diff --git a/lints/sysvar_address_check/README.md b/lints/sysvar_address_check/README.md
new file mode 100644
index 0000000..f3079a7
--- /dev/null
+++ b/lints/sysvar_address_check/README.md
@@ -0,0 +1,19 @@
+# template
+
+**What it does:**
+
+**Why is this bad?**
+
+**Known problems:** None.
+
+**Example:**
+
+```rust
+// example code where a warning is issued
+```
+
+Use instead:
+
+```rust
+// example code that does not raise a warning
+```
diff --git a/lints/sysvar_address_check/rust-toolchain b/lints/sysvar_address_check/rust-toolchain
new file mode 100644
index 0000000..2056264
--- /dev/null
+++ b/lints/sysvar_address_check/rust-toolchain
@@ -0,0 +1,3 @@
+[toolchain]
+channel = "nightly-2022-06-30"
+components = ["llvm-tools-preview", "rustc-dev"]
diff --git a/lints/sysvar_address_check/src/lib.rs b/lints/sysvar_address_check/src/lib.rs
new file mode 100644
index 0000000..98beddd
--- /dev/null
+++ b/lints/sysvar_address_check/src/lib.rs
@@ -0,0 +1,142 @@
+#![feature(rustc_private)]
+#![warn(unused_extern_crates)]
+#![recursion_limit = "256"]
+
+extern crate rustc_hir;
+extern crate rustc_middle;
+extern crate rustc_span;
+
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_hir::*;
+use rustc_hir::def::Res;
+use rustc_span::Span;
+use rustc_hir::{intravisit::{Visitor, walk_expr, FnKind}};
+use rustc_middle::ty::TyKind;
+
+use clippy_utils::{match_def_path};
+use if_chain::if_chain;
+mod paths;
+
+dylint_linting::declare_late_lint! {
+    /// **What it does:**
+    ///
+    /// **Why is this bad?**
+    ///
+    /// **Known problems:** None.
+    ///
+    /// **Example:**
+    ///
+    /// ```rust
+    /// // example code where a warning is issued
+    /// ```
+    /// Use instead:
+    /// ```rust
+    /// // example code that does not raise a warning
+    /// ```
+    pub SYSVAR_ADDRESS_CHECK,
+    Warn,
+    "description goes here"
+}
+
+impl<'tcx> LateLintPass<'tcx> for SysvarAddressCheck {
+    fn check_fn(
+    &mut self,
+    cx: &LateContext<'tcx>,
+    _: FnKind<'tcx>,
+    _: &'tcx FnDecl<'tcx>,
+    body: &'tcx Body<'tcx>,
+    span: Span,
+    _: HirId
+    ) {
+        // 1. grab types
+        // check for calls to bincode::deserialize and grab argument
+        // grab the type and check it derives Sysvar
+        // if so store the AccountInfo
+        // 2. check for key checks
+        // there is some check on AccountInfo.key == ID of Sysvar program
+        let mut accounts = AccountUses {
+            cx,
+            uses: Vec::new(),
+        };
+        accounts.visit_expr(&body.value);
+        
+    }
+
+    // fn check_block(&mut self, cx: &LateContext<'tcx>, block: &'tcx Block<'tcx>) {
+    //     // if !block.span.from_expansion() {
+    //     //     println!("{:#?}", block);
+    //     // }
+    //     for stmt in block.stmts {
+    //         if_chain! {
+    //             if !stmt.span.from_expansion();
+    //             if let StmtKind::Local(local) = stmt.kind;
+    //             if let Some(expr) = local.init;
+    //             let _ = println!("{:#?}", expr);
+    //             if is_deserialize_call(cx, expr);
+    //             // if let Some(ty) = local.ty;
+    //             then {
+    //                 // derives_sysvar(ty);
+    //                 // println!("{:#?}", local);
+    //             }
+    //         }
+
+    //     }
+    // }
+}
+
+struct AccountUses<'cx, 'tcx> {
+    cx: &'cx LateContext<'tcx>,
+    uses: Vec<&'tcx Expr<'tcx>>,
+}
+
+impl<'cx, 'tcx> Visitor<'tcx> for AccountUses<'cx, 'tcx> {
+    fn visit_expr(&mut self, expr: &'tcx Expr<'tcx>) {
+        if_chain! {
+            // check if bincode::deserialize call
+            if let ExprKind::Call(fnc_expr, args_expr) = expr.kind;
+            if let ExprKind::Path(qpath) = &fnc_expr.kind;
+            let res = self.cx.qpath_res(qpath, fnc_expr.hir_id);
+            if let Res::Def(_, def_id) = res;
+            if match_def_path(self.cx, def_id, &paths::BINCODE_DESERIALIZE);
+            // check type of expr
+            let ty = self.cx.typeck_results().expr_ty(expr);
+            // assumes type is always Result type, which should be the case
+            if let TyKind::Adt(_, substs) = ty.kind();
+            if !substs.is_empty();
+            let deser_type = substs[0];
+            let _ = println!("{:#?}", deser_type);
+            // // temp code for grabbing DefId of generic arg: Rent
+            // if let QPath::Resolved(_, path) = qpath;
+            // if let Some(generic_args) = path.segments[1].args;
+            // if let GenericArg::Type(ty) = &generic_args.args[0];
+            // if let TyKind::Path(qpath_sub) = &ty.kind;
+            // let res_sub = self.cx.qpath_res(qpath_sub, ty.hir_id);
+            // if let Res::Def(_, ty_id) = res_sub;
+            then {
+                println!("{:#?}", def_id);
+                
+            }
+        }
+        walk_expr(self, expr);
+    }
+}
+
+fn is_deserialize_call<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) -> bool {
+    let mut accounts = AccountUses {
+        cx,
+        uses: Vec::new(),
+    };
+
+    accounts.visit_expr(expr);
+    true
+}
+
+#[test]
+fn insecure() {
+    dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "insecure");
+}
+
+#[test]
+fn insecure_2() {
+    dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "insecure-2");
+}
diff --git a/lints/sysvar_address_check/src/paths.rs b/lints/sysvar_address_check/src/paths.rs
new file mode 100644
index 0000000..d9917c8
--- /dev/null
+++ b/lints/sysvar_address_check/src/paths.rs
@@ -0,0 +1 @@
+pub const BINCODE_DESERIALIZE: [&str; 2] = ["bincode", "deserialize"];
\ No newline at end of file
diff --git a/lints/sysvar_address_check/ui/insecure-2/Cargo.lock b/lints/sysvar_address_check/ui/insecure-2/Cargo.lock
new file mode 100644
index 0000000..4126f74
--- /dev/null
+++ b/lints/sysvar_address_check/ui/insecure-2/Cargo.lock
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diff --git a/lints/sysvar_address_check/ui/insecure-2/Cargo.toml b/lints/sysvar_address_check/ui/insecure-2/Cargo.toml
new file mode 100644
index 0000000..e652a7d
--- /dev/null
+++ b/lints/sysvar_address_check/ui/insecure-2/Cargo.toml
@@ -0,0 +1,25 @@
+[package]
+name = "insecure"
+version = "0.1.0"
+description = "Created with Anchor"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib", "lib"]
+name = "insecure"
+
+[features]
+no-entrypoint = []
+no-idl = []
+no-log-ix-name = []
+cpi = ["no-entrypoint"]
+default = []
+
+[profile.release]
+overflow-checks = true
+
+[workspace]
+
+[dependencies]
+anchor-lang = "0.25.0"
+bincode = "1.3.3"
diff --git a/lints/sysvar_address_check/ui/insecure-2/Xargo.toml b/lints/sysvar_address_check/ui/insecure-2/Xargo.toml
new file mode 100644
index 0000000..475fb71
--- /dev/null
+++ b/lints/sysvar_address_check/ui/insecure-2/Xargo.toml
@@ -0,0 +1,2 @@
+[target.bpfel-unknown-unknown.dependencies.std]
+features = []
diff --git a/lints/sysvar_address_check/ui/insecure-2/src/lib.rs b/lints/sysvar_address_check/ui/insecure-2/src/lib.rs
new file mode 100644
index 0000000..a5344da
--- /dev/null
+++ b/lints/sysvar_address_check/ui/insecure-2/src/lib.rs
@@ -0,0 +1,21 @@
+use anchor_lang::prelude::*;
+
+declare_id!("Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS");
+
+#[program]
+pub mod insecure {
+    use super::*;
+
+    pub fn check_sysvar_address(ctx: Context<CheckSysvarAddress>) -> Result<()> {
+        let rent: Rent = bincode::deserialize(&ctx.accounts.rent.data.borrow()).unwrap();
+        msg!("Rent -> {}", rent.lamports_per_byte_year);
+        Ok(())
+    }
+}
+
+#[derive(Accounts)]
+pub struct CheckSysvarAddress<'info> {
+    rent: AccountInfo<'info>,
+}
+
+fn main() {}
diff --git a/lints/sysvar_address_check/ui/insecure/Cargo.toml b/lints/sysvar_address_check/ui/insecure/Cargo.toml
new file mode 100644
index 0000000..00bb8f8
--- /dev/null
+++ b/lints/sysvar_address_check/ui/insecure/Cargo.toml
@@ -0,0 +1,22 @@
+[package]
+name = "insecure"
+version = "0.1.0"
+description = "Created with Anchor"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib", "lib"]
+name = "insecure"
+
+[features]
+no-entrypoint = []
+no-idl = []
+no-log-ix-name = []
+cpi = ["no-entrypoint"]
+default = []
+
+[profile.release]
+overflow-checks = true
+
+[dependencies]
+anchor-lang = "0.25.0"
diff --git a/lints/sysvar_address_check/ui/insecure/Xargo.toml b/lints/sysvar_address_check/ui/insecure/Xargo.toml
new file mode 100644
index 0000000..475fb71
--- /dev/null
+++ b/lints/sysvar_address_check/ui/insecure/Xargo.toml
@@ -0,0 +1,2 @@
+[target.bpfel-unknown-unknown.dependencies.std]
+features = []
diff --git a/lints/sysvar_address_check/ui/insecure/src/lib.rs b/lints/sysvar_address_check/ui/insecure/src/lib.rs
new file mode 100644
index 0000000..ac32629
--- /dev/null
+++ b/lints/sysvar_address_check/ui/insecure/src/lib.rs
@@ -0,0 +1,18 @@
+use anchor_lang::prelude::*;
+
+declare_id!("Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS");
+
+#[program]
+pub mod insecure {
+    use super::*;
+
+    pub fn check_sysvar_address(ctx: Context<CheckSysvarAddress>) -> Result<()> {
+        msg!("Rent Key -> {}", ctx.accounts.rent.key().to_string());
+        Ok(())
+    }
+}
+
+#[derive(Accounts)]
+pub struct CheckSysvarAddress<'info> {
+    rent: AccountInfo<'info>,
+}
diff --git a/lints/sysvar_address_check/ui/recommended/Cargo.toml b/lints/sysvar_address_check/ui/recommended/Cargo.toml
new file mode 100644
index 0000000..2bdd671
--- /dev/null
+++ b/lints/sysvar_address_check/ui/recommended/Cargo.toml
@@ -0,0 +1,22 @@
+[package]
+name = "recommended"
+version = "0.1.0"
+description = "Created with Anchor"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib", "lib"]
+name = "secure"
+
+[features]
+no-entrypoint = []
+no-idl = []
+no-log-ix-name = []
+cpi = ["no-entrypoint"]
+default = []
+
+[profile.release]
+overflow-checks = true
+
+[dependencies]
+anchor-lang = "0.25.0"
diff --git a/lints/sysvar_address_check/ui/recommended/Xargo.toml b/lints/sysvar_address_check/ui/recommended/Xargo.toml
new file mode 100644
index 0000000..475fb71
--- /dev/null
+++ b/lints/sysvar_address_check/ui/recommended/Xargo.toml
@@ -0,0 +1,2 @@
+[target.bpfel-unknown-unknown.dependencies.std]
+features = []
diff --git a/lints/sysvar_address_check/ui/recommended/src/lib.rs b/lints/sysvar_address_check/ui/recommended/src/lib.rs
new file mode 100644
index 0000000..6491d94
--- /dev/null
+++ b/lints/sysvar_address_check/ui/recommended/src/lib.rs
@@ -0,0 +1,18 @@
+use anchor_lang::prelude::*;
+
+declare_id!("Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS");
+
+#[program]
+pub mod recommended {
+    use super::*;
+
+    pub fn check_sysvar_address(ctx: Context<CheckSysvarAddress>) -> Result<()> {
+        msg!("Rent Key -> {}", ctx.accounts.rent.key().to_string());
+        Ok(())
+    }
+}
+
+#[derive(Accounts)]
+pub struct CheckSysvarAddress<'info> {
+    rent: Sysvar<'info, Rent>,
+}
diff --git a/lints/sysvar_address_check/ui/secure/Cargo.toml b/lints/sysvar_address_check/ui/secure/Cargo.toml
new file mode 100644
index 0000000..7ddb184
--- /dev/null
+++ b/lints/sysvar_address_check/ui/secure/Cargo.toml
@@ -0,0 +1,19 @@
+[package]
+name = "secure"
+version = "0.1.0"
+description = "Created with Anchor"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib", "lib"]
+name = "secure"
+
+[features]
+no-entrypoint = []
+no-idl = []
+no-log-ix-name = []
+cpi = ["no-entrypoint"]
+default = []
+
+[dependencies]
+anchor-lang = "0.25.0"
diff --git a/lints/sysvar_address_check/ui/secure/Xargo.toml b/lints/sysvar_address_check/ui/secure/Xargo.toml
new file mode 100644
index 0000000..475fb71
--- /dev/null
+++ b/lints/sysvar_address_check/ui/secure/Xargo.toml
@@ -0,0 +1,2 @@
+[target.bpfel-unknown-unknown.dependencies.std]
+features = []
diff --git a/lints/sysvar_address_check/ui/secure/src/lib.rs b/lints/sysvar_address_check/ui/secure/src/lib.rs
new file mode 100644
index 0000000..fb8cb9f
--- /dev/null
+++ b/lints/sysvar_address_check/ui/secure/src/lib.rs
@@ -0,0 +1,19 @@
+use anchor_lang::prelude::*;
+use anchor_lang::solana_program::sysvar;
+declare_id!("Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS");
+
+#[program]
+pub mod secure {
+    use super::*;
+
+    pub fn check_sysvar_address(ctx: Context<CheckSysvarAddress>) -> Result<()> {
+        require_eq!(ctx.accounts.rent.key(), sysvar::rent::ID);
+        msg!("Rent Key -> {}", ctx.accounts.rent.key().to_string());
+        Ok(())
+    }
+}
+
+#[derive(Accounts)]
+pub struct CheckSysvarAddress<'info> {
+    rent: AccountInfo<'info>,
+}

From a0d3e88f407917e352a722e565842a83c86f298c Mon Sep 17 00:00:00 2001
From: Victor Wei <vw1262@gmail.com>
Date: Wed, 27 Jul 2022 14:19:04 -0500
Subject: [PATCH 2/7] implement lint 10 w/o key check

---
 lints/sysvar_address_check/src/lib.rs   | 97 +++++++++----------------
 lints/sysvar_address_check/src/paths.rs |  4 +-
 2 files changed, 38 insertions(+), 63 deletions(-)

diff --git a/lints/sysvar_address_check/src/lib.rs b/lints/sysvar_address_check/src/lib.rs
index 98beddd..e484834 100644
--- a/lints/sysvar_address_check/src/lib.rs
+++ b/lints/sysvar_address_check/src/lib.rs
@@ -1,19 +1,20 @@
 #![feature(rustc_private)]
 #![warn(unused_extern_crates)]
-#![recursion_limit = "256"]
 
 extern crate rustc_hir;
 extern crate rustc_middle;
 extern crate rustc_span;
 
-use rustc_lint::{LateContext, LateLintPass};
-use rustc_hir::*;
 use rustc_hir::def::Res;
-use rustc_span::Span;
-use rustc_hir::{intravisit::{Visitor, walk_expr, FnKind}};
+use rustc_hir::intravisit::{walk_expr, FnKind, Visitor};
+use rustc_hir::{Body, Expr, ExprKind, FnDecl, HirId};
+use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty::TyKind;
+use rustc_span::Span;
 
-use clippy_utils::{match_def_path};
+use clippy_utils::{
+    diagnostics::span_lint_and_note, get_trait_def_id, match_def_path, ty::implements_trait,
+};
 use if_chain::if_chain;
 mod paths;
 
@@ -40,13 +41,13 @@ dylint_linting::declare_late_lint! {
 
 impl<'tcx> LateLintPass<'tcx> for SysvarAddressCheck {
     fn check_fn(
-    &mut self,
-    cx: &LateContext<'tcx>,
-    _: FnKind<'tcx>,
-    _: &'tcx FnDecl<'tcx>,
-    body: &'tcx Body<'tcx>,
-    span: Span,
-    _: HirId
+        &mut self,
+        cx: &LateContext<'tcx>,
+        _: FnKind<'tcx>,
+        _: &'tcx FnDecl<'tcx>,
+        body: &'tcx Body<'tcx>,
+        _: Span,
+        _: HirId,
     ) {
         // 1. grab types
         // check for calls to bincode::deserialize and grab argument
@@ -54,46 +55,26 @@ impl<'tcx> LateLintPass<'tcx> for SysvarAddressCheck {
         // if so store the AccountInfo
         // 2. check for key checks
         // there is some check on AccountInfo.key == ID of Sysvar program
-        let mut accounts = AccountUses {
-            cx,
-            uses: Vec::new(),
-        };
+
+        // 1. walk function body and search for calls to bincode::deserialize
+        // 2. retrieve the type of this expression (which is what is being deserialized to),
+        // and check that the type implements the Sysvar trait
+        // 3. if so, flag the lint and issue warning that user should not deserialize directly,
+        // but instead use from_account_info() method from Sysvar trait
+        let mut accounts = AccountUses { cx };
         accounts.visit_expr(&body.value);
-        
     }
-
-    // fn check_block(&mut self, cx: &LateContext<'tcx>, block: &'tcx Block<'tcx>) {
-    //     // if !block.span.from_expansion() {
-    //     //     println!("{:#?}", block);
-    //     // }
-    //     for stmt in block.stmts {
-    //         if_chain! {
-    //             if !stmt.span.from_expansion();
-    //             if let StmtKind::Local(local) = stmt.kind;
-    //             if let Some(expr) = local.init;
-    //             let _ = println!("{:#?}", expr);
-    //             if is_deserialize_call(cx, expr);
-    //             // if let Some(ty) = local.ty;
-    //             then {
-    //                 // derives_sysvar(ty);
-    //                 // println!("{:#?}", local);
-    //             }
-    //         }
-
-    //     }
-    // }
 }
 
 struct AccountUses<'cx, 'tcx> {
     cx: &'cx LateContext<'tcx>,
-    uses: Vec<&'tcx Expr<'tcx>>,
 }
 
 impl<'cx, 'tcx> Visitor<'tcx> for AccountUses<'cx, 'tcx> {
     fn visit_expr(&mut self, expr: &'tcx Expr<'tcx>) {
         if_chain! {
             // check if bincode::deserialize call
-            if let ExprKind::Call(fnc_expr, args_expr) = expr.kind;
+            if let ExprKind::Call(fnc_expr, _args_expr) = expr.kind;
             if let ExprKind::Path(qpath) = &fnc_expr.kind;
             let res = self.cx.qpath_res(qpath, fnc_expr.hir_id);
             if let Res::Def(_, def_id) = res;
@@ -103,34 +84,26 @@ impl<'cx, 'tcx> Visitor<'tcx> for AccountUses<'cx, 'tcx> {
             // assumes type is always Result type, which should be the case
             if let TyKind::Adt(_, substs) = ty.kind();
             if !substs.is_empty();
-            let deser_type = substs[0];
-            let _ = println!("{:#?}", deser_type);
-            // // temp code for grabbing DefId of generic arg: Rent
-            // if let QPath::Resolved(_, path) = qpath;
-            // if let Some(generic_args) = path.segments[1].args;
-            // if let GenericArg::Type(ty) = &generic_args.args[0];
-            // if let TyKind::Path(qpath_sub) = &ty.kind;
-            // let res_sub = self.cx.qpath_res(qpath_sub, ty.hir_id);
-            // if let Res::Def(_, ty_id) = res_sub;
+            let deser_type = substs[0].expect_ty();
+            // check type implements Sysvar
+            if let Some(trait_id) = get_trait_def_id(self.cx, &paths::ANCHOR_SYSVAR_TRAIT);
+            if implements_trait(self.cx, deser_type, trait_id, &[]);
             then {
-                println!("{:#?}", def_id);
-                
+                // grab AccountInfo
+                span_lint_and_note(
+                    self.cx,
+                    SYSVAR_ADDRESS_CHECK,
+                    expr.span,
+                    "raw deserialization of a type that implements Sysvar",
+                    None,
+                    "use from_account_info() instead"
+                );
             }
         }
         walk_expr(self, expr);
     }
 }
 
-fn is_deserialize_call<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) -> bool {
-    let mut accounts = AccountUses {
-        cx,
-        uses: Vec::new(),
-    };
-
-    accounts.visit_expr(expr);
-    true
-}
-
 #[test]
 fn insecure() {
     dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "insecure");
diff --git a/lints/sysvar_address_check/src/paths.rs b/lints/sysvar_address_check/src/paths.rs
index d9917c8..f66d583 100644
--- a/lints/sysvar_address_check/src/paths.rs
+++ b/lints/sysvar_address_check/src/paths.rs
@@ -1 +1,3 @@
-pub const BINCODE_DESERIALIZE: [&str; 2] = ["bincode", "deserialize"];
\ No newline at end of file
+pub const BINCODE_DESERIALIZE: [&str; 2] = ["bincode", "deserialize"];
+pub const ANCHOR_SYSVAR_TRAIT: [&str; 3] = ["anchor_lang", "prelude", "SolanaSysvar"];
+// pub const SOLANA_SYSVAR_TRAIT: [&str; 3] = ["solana_program", "sysvar", "Sysvar"];

From cb42c48a3f1137f050de21204d09f09d9ce58ba0 Mon Sep 17 00:00:00 2001
From: Victor Wei <vw1262@gmail.com>
Date: Wed, 27 Jul 2022 14:45:33 -0500
Subject: [PATCH 3/7] cleanup insecure-2 test

---
 lints/sysvar_address_check/src/lib.rs             | 15 +++++++++------
 .../ui/insecure-2/src/lib.stderr                  | 11 +++++++++++
 lints/sysvar_address_check/ui/insecure/src/lib.rs |  2 ++
 3 files changed, 22 insertions(+), 6 deletions(-)
 create mode 100644 lints/sysvar_address_check/ui/insecure-2/src/lib.stderr

diff --git a/lints/sysvar_address_check/src/lib.rs b/lints/sysvar_address_check/src/lib.rs
index e484834..895dfd9 100644
--- a/lints/sysvar_address_check/src/lib.rs
+++ b/lints/sysvar_address_check/src/lib.rs
@@ -13,7 +13,7 @@ use rustc_middle::ty::TyKind;
 use rustc_span::Span;
 
 use clippy_utils::{
-    diagnostics::span_lint_and_note, get_trait_def_id, match_def_path, ty::implements_trait,
+    diagnostics::span_lint_and_help, get_trait_def_id, match_def_path, ty::implements_trait,
 };
 use if_chain::if_chain;
 mod paths;
@@ -90,7 +90,7 @@ impl<'cx, 'tcx> Visitor<'tcx> for AccountUses<'cx, 'tcx> {
             if implements_trait(self.cx, deser_type, trait_id, &[]);
             then {
                 // grab AccountInfo
-                span_lint_and_note(
+                span_lint_and_help(
                     self.cx,
                     SYSVAR_ADDRESS_CHECK,
                     expr.span,
@@ -104,10 +104,13 @@ impl<'cx, 'tcx> Visitor<'tcx> for AccountUses<'cx, 'tcx> {
     }
 }
 
-#[test]
-fn insecure() {
-    dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "insecure");
-}
+// Not checking sealevel insecure case because in its current form, it is technically not even
+// insecure. It does not deserialize from `rent.data`, thus possibly incorrectly assuming that
+// this is a Rent struct. It is insecure in the sense there is no key check.
+// #[test]
+// fn insecure() {
+//     dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "insecure");
+// }
 
 #[test]
 fn insecure_2() {
diff --git a/lints/sysvar_address_check/ui/insecure-2/src/lib.stderr b/lints/sysvar_address_check/ui/insecure-2/src/lib.stderr
new file mode 100644
index 0000000..af758c5
--- /dev/null
+++ b/lints/sysvar_address_check/ui/insecure-2/src/lib.stderr
@@ -0,0 +1,11 @@
+error: raw deserialization of a type that implements Sysvar
+  --> $DIR/lib.rs:10:26
+   |
+LL |         let rent: Rent = bincode::deserialize(&ctx.accounts.rent.data.borrow()).unwrap();
+   |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `-D sysvar-address-check` implied by `-D warnings`
+   = help: use from_account_info() instead
+
+error: aborting due to previous error
+
diff --git a/lints/sysvar_address_check/ui/insecure/src/lib.rs b/lints/sysvar_address_check/ui/insecure/src/lib.rs
index ac32629..95f9800 100644
--- a/lints/sysvar_address_check/ui/insecure/src/lib.rs
+++ b/lints/sysvar_address_check/ui/insecure/src/lib.rs
@@ -16,3 +16,5 @@ pub mod insecure {
 pub struct CheckSysvarAddress<'info> {
     rent: AccountInfo<'info>,
 }
+
+fn main() {}

From 8d85e4c94be4562c76047a1b8577b8c8fd759fb1 Mon Sep 17 00:00:00 2001
From: Victor Wei <vw1262@gmail.com>
Date: Wed, 27 Jul 2022 15:05:00 -0500
Subject: [PATCH 4/7] add secure-2 test

---
 lints/sysvar_address_check/Cargo.toml         |  4 ++++
 lints/sysvar_address_check/src/lib.rs         | 10 +++++++-
 .../ui/secure-2/Cargo.toml                    | 24 +++++++++++++++++++
 .../ui/secure-2/Xargo.toml                    |  2 ++
 .../ui/secure-2/src/lib.rs                    | 21 ++++++++++++++++
 .../ui/secure-2/src/lib.stderr                |  0
 6 files changed, 60 insertions(+), 1 deletion(-)
 create mode 100644 lints/sysvar_address_check/ui/secure-2/Cargo.toml
 create mode 100644 lints/sysvar_address_check/ui/secure-2/Xargo.toml
 create mode 100644 lints/sysvar_address_check/ui/secure-2/src/lib.rs
 create mode 100644 lints/sysvar_address_check/ui/secure-2/src/lib.stderr

diff --git a/lints/sysvar_address_check/Cargo.toml b/lints/sysvar_address_check/Cargo.toml
index ccacc6a..ae4e320 100644
--- a/lints/sysvar_address_check/Cargo.toml
+++ b/lints/sysvar_address_check/Cargo.toml
@@ -17,6 +17,10 @@ path = "ui/insecure/src/lib.rs"
 name = "insecure-2"
 path = "ui/insecure-2/src/lib.rs"
 
+[[example]]
+name = "secure-2"
+path = "ui/secure-2/src/lib.rs"
+
 [dependencies]
 clippy_utils = { git = "https://github.com/rust-lang/rust-clippy", rev = "0cb0f7636851f9fcc57085cf80197a2ef6db098f" }
 dylint_linting = "2.0.7"
diff --git a/lints/sysvar_address_check/src/lib.rs b/lints/sysvar_address_check/src/lib.rs
index 895dfd9..78aed72 100644
--- a/lints/sysvar_address_check/src/lib.rs
+++ b/lints/sysvar_address_check/src/lib.rs
@@ -96,7 +96,7 @@ impl<'cx, 'tcx> Visitor<'tcx> for AccountUses<'cx, 'tcx> {
                     expr.span,
                     "raw deserialization of a type that implements Sysvar",
                     None,
-                    "use from_account_info() instead"
+                    "use from_account_info() instead",
                 );
             }
         }
@@ -112,7 +112,15 @@ impl<'cx, 'tcx> Visitor<'tcx> for AccountUses<'cx, 'tcx> {
 //     dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "insecure");
 // }
 
+// Not testing sealevel secure case because this lint will flag any attempt to do a "raw"
+// deserialization. The canonical way should be using from_account_info().
+
 #[test]
 fn insecure_2() {
     dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "insecure-2");
 }
+
+#[test]
+fn secure_2() {
+    dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "secure-2");
+}
diff --git a/lints/sysvar_address_check/ui/secure-2/Cargo.toml b/lints/sysvar_address_check/ui/secure-2/Cargo.toml
new file mode 100644
index 0000000..b3f0146
--- /dev/null
+++ b/lints/sysvar_address_check/ui/secure-2/Cargo.toml
@@ -0,0 +1,24 @@
+[package]
+name = "insecure"
+version = "0.1.0"
+description = "Created with Anchor"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib", "lib"]
+name = "insecure"
+
+[features]
+no-entrypoint = []
+no-idl = []
+no-log-ix-name = []
+cpi = ["no-entrypoint"]
+default = []
+
+[profile.release]
+overflow-checks = true
+
+[workspace]
+
+[dependencies]
+anchor-lang = "0.25.0"
diff --git a/lints/sysvar_address_check/ui/secure-2/Xargo.toml b/lints/sysvar_address_check/ui/secure-2/Xargo.toml
new file mode 100644
index 0000000..475fb71
--- /dev/null
+++ b/lints/sysvar_address_check/ui/secure-2/Xargo.toml
@@ -0,0 +1,2 @@
+[target.bpfel-unknown-unknown.dependencies.std]
+features = []
diff --git a/lints/sysvar_address_check/ui/secure-2/src/lib.rs b/lints/sysvar_address_check/ui/secure-2/src/lib.rs
new file mode 100644
index 0000000..bcf4be5
--- /dev/null
+++ b/lints/sysvar_address_check/ui/secure-2/src/lib.rs
@@ -0,0 +1,21 @@
+use anchor_lang::prelude::*;
+
+declare_id!("Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS");
+
+#[program]
+pub mod insecure {
+    use super::*;
+
+    pub fn check_sysvar_address(ctx: Context<CheckSysvarAddress>) -> Result<()> {
+        let rent = Rent::from_account_info(&ctx.accounts.rent).unwrap();
+        msg!("Rent -> {}", rent.lamports_per_byte_year);
+        Ok(())
+    }
+}
+
+#[derive(Accounts)]
+pub struct CheckSysvarAddress<'info> {
+    rent: AccountInfo<'info>,
+}
+
+fn main() {}
diff --git a/lints/sysvar_address_check/ui/secure-2/src/lib.stderr b/lints/sysvar_address_check/ui/secure-2/src/lib.stderr
new file mode 100644
index 0000000..e69de29

From e7e5c3272ea25fc2e59785153d02615f63db0715 Mon Sep 17 00:00:00 2001
From: Victor Wei <vw1262@gmail.com>
Date: Wed, 3 Aug 2022 14:06:16 -0500
Subject: [PATCH 5/7] implement anchor check

---
 crate/src/paths.rs                            |    5 +-
 lints/sysvar_address_check/Cargo.lock         |   15 +-
 lints/sysvar_address_check/Cargo.toml         |   11 +-
 lints/sysvar_address_check/README.md          |   15 +-
 lints/sysvar_address_check/src/lib.rs         |   67 +-
 lints/sysvar_address_check/src/paths.rs       |    4 +-
 .../ui/insecure-2/Cargo.lock                  | 1408 -----------------
 .../ui/insecure-anchor/Cargo.toml             |   24 +
 .../ui/insecure-anchor/Xargo.toml             |    2 +
 .../ui/insecure-anchor/src/lib.rs             |   43 +
 .../ui/insecure-anchor/src/lib.stderr         |   11 +
 .../ui/recommended/src/lib.rs                 |    2 +
 .../ui/recommended/src/lib.stderr             |    0
 13 files changed, 172 insertions(+), 1435 deletions(-)
 delete mode 100644 lints/sysvar_address_check/ui/insecure-2/Cargo.lock
 create mode 100644 lints/sysvar_address_check/ui/insecure-anchor/Cargo.toml
 create mode 100644 lints/sysvar_address_check/ui/insecure-anchor/Xargo.toml
 create mode 100644 lints/sysvar_address_check/ui/insecure-anchor/src/lib.rs
 create mode 100644 lints/sysvar_address_check/ui/insecure-anchor/src/lib.stderr
 create mode 100644 lints/sysvar_address_check/ui/recommended/src/lib.stderr

diff --git a/crate/src/paths.rs b/crate/src/paths.rs
index 2bf04d7..60301c1 100644
--- a/crate/src/paths.rs
+++ b/crate/src/paths.rs
@@ -1,6 +1,9 @@
 pub const ANCHOR_LANG_CONTEXT: [&str; 3] = ["anchor_lang", "context", "Context"];
 pub const ANCHOR_LANG_SIGNER: [&str; 4] = ["anchor_lang", "accounts", "signer", "Signer"];
-
+pub const ANCHOR_ACCOUNT: [&str; 4] = ["anchor_lang", "accounts", "account", "Account"];
 pub const SOLANA_PROGRAM_ACCOUNT_INFO: [&str; 3] =
     ["solana_program", "account_info", "AccountInfo"];
 pub const BORSH_TRY_FROM_SLICE: [&str; 4] = ["borsh", "de", "BorshDeserialize", "try_from_slice"];
+pub const BINCODE_DESERIALIZE: [&str; 2] = ["bincode", "deserialize"];
+pub const ANCHOR_SYSVAR_TRAIT: [&str; 3] = ["anchor_lang", "prelude", "SolanaSysvar"];
+pub const SOLANA_SYSVAR_TRAIT: [&str; 3] = ["solana_program", "sysvar", "Sysvar"];
diff --git a/lints/sysvar_address_check/Cargo.lock b/lints/sysvar_address_check/Cargo.lock
index 821c58c..52dd50e 100644
--- a/lints/sysvar_address_check/Cargo.lock
+++ b/lints/sysvar_address_check/Cargo.lock
@@ -1425,9 +1425,9 @@ dependencies = [
 
 [[package]]
 name = "serde"
-version = "1.0.140"
+version = "1.0.142"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fc855a42c7967b7c369eb5860f7164ef1f6f81c20c7cc1141f2a604e18723b03"
+checksum = "e590c437916fb6b221e1d00df6e3294f3fccd70ca7e92541c475d6ed6ef5fee2"
 dependencies = [
  "serde_derive",
 ]
@@ -1443,9 +1443,9 @@ dependencies = [
 
 [[package]]
 name = "serde_derive"
-version = "1.0.140"
+version = "1.0.142"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6f2122636b9fe3b81f1cb25099fcf2d3f542cdb1d45940d56c713158884a05da"
+checksum = "34b5b8d809babe02f538c2cfec6f2c1ed10804c0e5a6a041a049a4f5588ccc2e"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1547,6 +1547,10 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "solana-lints"
+version = "0.1.0"
+
 [[package]]
 name = "solana-program"
 version = "1.10.32"
@@ -1629,6 +1633,9 @@ dependencies = [
  "dylint_linting",
  "dylint_testing",
  "if_chain",
+ "serde",
+ "solana-lints",
+ "solana-program",
 ]
 
 [[package]]
diff --git a/lints/sysvar_address_check/Cargo.toml b/lints/sysvar_address_check/Cargo.toml
index ae4e320..828e30f 100644
--- a/lints/sysvar_address_check/Cargo.toml
+++ b/lints/sysvar_address_check/Cargo.toml
@@ -10,8 +10,12 @@ publish = false
 crate-type = ["cdylib"]
 
 [[example]]
-name = "insecure"
-path = "ui/insecure/src/lib.rs"
+name = "insecure-anchor"
+path = "ui/insecure-anchor/src/lib.rs"
+
+[[example]]
+name = "recommended"
+path = "ui/recommended/src/lib.rs"
 
 [[example]]
 name = "insecure-2"
@@ -25,11 +29,14 @@ path = "ui/secure-2/src/lib.rs"
 clippy_utils = { git = "https://github.com/rust-lang/rust-clippy", rev = "0cb0f7636851f9fcc57085cf80197a2ef6db098f" }
 dylint_linting = "2.0.7"
 if_chain = "1.0.2"
+solana-lints = { path = "../../crate" }
 
 [dev-dependencies]
 anchor-lang = "0.25.0"
 bincode = "1.3.3"
 dylint_testing = "2.0.7"
+serde = { version = "1.0.141", features = ["derive"] }
+solana-program = "1.10.29"
 
 [workspace]
 
diff --git a/lints/sysvar_address_check/README.md b/lints/sysvar_address_check/README.md
index f3079a7..82b6f18 100644
--- a/lints/sysvar_address_check/README.md
+++ b/lints/sysvar_address_check/README.md
@@ -1,4 +1,4 @@
-# template
+# sysvar_address_check
 
 **What it does:**
 
@@ -17,3 +17,16 @@ Use instead:
 ```rust
 // example code that does not raise a warning
 ```
+
+**insecure-2:** an actual insecure example since it does deserialization without checking ID. Essentially what
+the sealevel-insecure example was trying to demonstrate
+**insecure-anchor:** an insecure example that more directly uses anchor, ie, uses Account<'info, T>, where T
+derives Sysvar. This doesn't do the ID check that the anchor Sysvar type does.
+**recommended:** the secure way to use anchor to check IDs. Directly fixes "insecure-anchor" by using Sysvar type.
+**secure-2:** Fixes "insecure-2" case. Uses the `from_account_info()` method, which performs the ID check.
+
+NOT TESTED:
+insecure: sealevel-example. not tested because it's technically not insecure, since it never attempts
+a deserialization
+secure: poor sealevel example. Does key check, but never deserializes, so technically the vulnerability is
+non-existent in this example.
\ No newline at end of file
diff --git a/lints/sysvar_address_check/src/lib.rs b/lints/sysvar_address_check/src/lib.rs
index 78aed72..2572bef 100644
--- a/lints/sysvar_address_check/src/lib.rs
+++ b/lints/sysvar_address_check/src/lib.rs
@@ -1,5 +1,6 @@
 #![feature(rustc_private)]
 #![warn(unused_extern_crates)]
+#![recursion_limit = "256"]
 
 extern crate rustc_hir;
 extern crate rustc_middle;
@@ -7,16 +8,16 @@ extern crate rustc_span;
 
 use rustc_hir::def::Res;
 use rustc_hir::intravisit::{walk_expr, FnKind, Visitor};
-use rustc_hir::{Body, Expr, ExprKind, FnDecl, HirId};
+use rustc_hir::{Body, Expr, ExprKind, FnDecl, HirId, FieldDef, TyKind as HirTyKind, GenericArg, QPath};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty::TyKind;
 use rustc_span::Span;
 
 use clippy_utils::{
-    diagnostics::span_lint_and_help, get_trait_def_id, match_def_path, ty::implements_trait,
+    diagnostics::span_lint_and_help, get_trait_def_id, match_def_path, ty::{implements_trait, match_type}
 };
 use if_chain::if_chain;
-mod paths;
+use solana_lints::paths;
 
 dylint_linting::declare_late_lint! {
     /// **What it does:**
@@ -40,6 +41,42 @@ dylint_linting::declare_late_lint! {
 }
 
 impl<'tcx> LateLintPass<'tcx> for SysvarAddressCheck {
+    fn check_field_def(&mut self, cx: &LateContext<'tcx>, field: &'tcx FieldDef<'tcx>) {
+        // if field is Anchor Account<'info, T>
+        // grab type T and if it derives Sysvar trait, flag lint
+        if_chain! {
+            // check field is type Account<'info, T>
+            if let HirTyKind::Path(qpath) = &field.ty.kind;
+            let res = cx.qpath_res(qpath, field.hir_id);
+            if let Res::Def(_, def_id) = res;
+            let middle_ty = cx.tcx.type_of(def_id);
+            if match_type(cx, middle_ty, &paths::ANCHOR_ACCOUNT);
+            // grab type T
+            if let QPath::Resolved(_, path) = qpath;
+            if !path.segments.is_empty();
+            if let Some(generic_args) = &path.segments[0].args;
+            if generic_args.args.len() > 1;
+            if let GenericArg::Type(ty) = &generic_args.args[1];
+            if let HirTyKind::Path(ty_qpath) = &ty.kind;
+            let ty_res = cx.qpath_res(ty_qpath, ty.hir_id);
+            if let Res::Def(_, type_def_id) = ty_res;
+            let account_type = cx.tcx.type_of(type_def_id);
+            // check if T derives Sysvar trait
+            if let Some(trait_id) = get_trait_def_id(cx, &paths::SOLANA_SYSVAR_TRAIT);
+            if implements_trait(cx, account_type, trait_id, &[]);
+            then {
+                span_lint_and_help(
+                    cx,
+                    SYSVAR_ADDRESS_CHECK,
+                    field.span,
+                    &format!("Anchor Account type T is '{}', which derives the Sysvar trait", account_type),
+                    None,
+                    &format!("Account type does not perform an ID check. Use Sysvar<'info, {}> instead", account_type),
+                );
+            }
+        }
+    }
+
     fn check_fn(
         &mut self,
         cx: &LateContext<'tcx>,
@@ -49,13 +86,6 @@ impl<'tcx> LateLintPass<'tcx> for SysvarAddressCheck {
         _: Span,
         _: HirId,
     ) {
-        // 1. grab types
-        // check for calls to bincode::deserialize and grab argument
-        // grab the type and check it derives Sysvar
-        // if so store the AccountInfo
-        // 2. check for key checks
-        // there is some check on AccountInfo.key == ID of Sysvar program
-
         // 1. walk function body and search for calls to bincode::deserialize
         // 2. retrieve the type of this expression (which is what is being deserialized to),
         // and check that the type implements the Sysvar trait
@@ -86,10 +116,9 @@ impl<'cx, 'tcx> Visitor<'tcx> for AccountUses<'cx, 'tcx> {
             if !substs.is_empty();
             let deser_type = substs[0].expect_ty();
             // check type implements Sysvar
-            if let Some(trait_id) = get_trait_def_id(self.cx, &paths::ANCHOR_SYSVAR_TRAIT);
+            if let Some(trait_id) = get_trait_def_id(self.cx, &paths::SOLANA_SYSVAR_TRAIT);
             if implements_trait(self.cx, deser_type, trait_id, &[]);
             then {
-                // grab AccountInfo
                 span_lint_and_help(
                     self.cx,
                     SYSVAR_ADDRESS_CHECK,
@@ -107,10 +136,6 @@ impl<'cx, 'tcx> Visitor<'tcx> for AccountUses<'cx, 'tcx> {
 // Not checking sealevel insecure case because in its current form, it is technically not even
 // insecure. It does not deserialize from `rent.data`, thus possibly incorrectly assuming that
 // this is a Rent struct. It is insecure in the sense there is no key check.
-// #[test]
-// fn insecure() {
-//     dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "insecure");
-// }
 
 // Not testing sealevel secure case because this lint will flag any attempt to do a "raw"
 // deserialization. The canonical way should be using from_account_info().
@@ -124,3 +149,13 @@ fn insecure_2() {
 fn secure_2() {
     dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "secure-2");
 }
+
+#[test]
+fn insecure_anchor() {
+    dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "insecure-anchor");
+}
+
+#[test]
+fn recommended() {
+    dylint_testing::ui_test_example(env!("CARGO_PKG_NAME"), "recommended");
+}
diff --git a/lints/sysvar_address_check/src/paths.rs b/lints/sysvar_address_check/src/paths.rs
index f66d583..8b13789 100644
--- a/lints/sysvar_address_check/src/paths.rs
+++ b/lints/sysvar_address_check/src/paths.rs
@@ -1,3 +1 @@
-pub const BINCODE_DESERIALIZE: [&str; 2] = ["bincode", "deserialize"];
-pub const ANCHOR_SYSVAR_TRAIT: [&str; 3] = ["anchor_lang", "prelude", "SolanaSysvar"];
-// pub const SOLANA_SYSVAR_TRAIT: [&str; 3] = ["solana_program", "sysvar", "Sysvar"];
+
diff --git a/lints/sysvar_address_check/ui/insecure-2/Cargo.lock b/lints/sysvar_address_check/ui/insecure-2/Cargo.lock
deleted file mode 100644
index 4126f74..0000000
--- a/lints/sysvar_address_check/ui/insecure-2/Cargo.lock
+++ /dev/null
@@ -1,1408 +0,0 @@
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-# It is not intended for manual editing.
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diff --git a/lints/sysvar_address_check/ui/insecure-anchor/Cargo.toml b/lints/sysvar_address_check/ui/insecure-anchor/Cargo.toml
new file mode 100644
index 0000000..ff1ace7
--- /dev/null
+++ b/lints/sysvar_address_check/ui/insecure-anchor/Cargo.toml
@@ -0,0 +1,24 @@
+[package]
+name = "recommended"
+version = "0.1.0"
+description = "Created with Anchor"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib", "lib"]
+name = "secure"
+
+[features]
+no-entrypoint = []
+no-idl = []
+no-log-ix-name = []
+cpi = ["no-entrypoint"]
+default = []
+
+[profile.release]
+overflow-checks = true
+
+[dependencies]
+anchor-lang = "0.25.0"
+serde = { version = "1.0.141", features = ["derive"] }
+solana-program = "1.10.29"
diff --git a/lints/sysvar_address_check/ui/insecure-anchor/Xargo.toml b/lints/sysvar_address_check/ui/insecure-anchor/Xargo.toml
new file mode 100644
index 0000000..475fb71
--- /dev/null
+++ b/lints/sysvar_address_check/ui/insecure-anchor/Xargo.toml
@@ -0,0 +1,2 @@
+[target.bpfel-unknown-unknown.dependencies.std]
+features = []
diff --git a/lints/sysvar_address_check/ui/insecure-anchor/src/lib.rs b/lints/sysvar_address_check/ui/insecure-anchor/src/lib.rs
new file mode 100644
index 0000000..a07f08f
--- /dev/null
+++ b/lints/sysvar_address_check/ui/insecure-anchor/src/lib.rs
@@ -0,0 +1,43 @@
+use anchor_lang::prelude::*;
+use solana_program::sysvar::SysvarId;
+use solana_program::pubkey;
+use serde::{Serialize, Deserialize};
+
+declare_id!("Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS");
+
+#[program]
+pub mod recommended {
+    use super::*;
+
+    pub fn check_sysvar_address(ctx: Context<CheckSysvarAddress>) -> Result<()> {
+        msg!("Rent -> {}", ctx.accounts.rent.lamports_per_byte_year);
+        Ok(())
+    }
+}
+
+#[derive(Accounts)]
+pub struct CheckSysvarAddress<'info> {
+    rent: Account<'info, RentCopy>,
+}
+
+#[account]
+#[derive(Default, Serialize, Deserialize)]
+pub struct RentCopy {
+    pub lamports_per_byte_year: u64,
+    pub exemption_threshold: f64,
+    pub burn_percent: u8,
+}
+
+impl SolanaSysvar for RentCopy {}
+
+impl SysvarId for RentCopy {
+    fn id() -> Pubkey {
+        pubkey!("SysvarRent111111111111111111111111111111111")
+    }
+
+    fn check_id(pubkey: &Pubkey) -> bool {
+        id() == *pubkey
+    }
+}
+
+fn main() {}
diff --git a/lints/sysvar_address_check/ui/insecure-anchor/src/lib.stderr b/lints/sysvar_address_check/ui/insecure-anchor/src/lib.stderr
new file mode 100644
index 0000000..f57103d
--- /dev/null
+++ b/lints/sysvar_address_check/ui/insecure-anchor/src/lib.stderr
@@ -0,0 +1,11 @@
+error: Anchor Account type T is 'RentCopy', which derives the Sysvar trait
+  --> $DIR/lib.rs:20:5
+   |
+LL |     rent: Account<'info, RentCopy>,
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `-D sysvar-address-check` implied by `-D warnings`
+   = help: Account type does not perform an ID check. Use Sysvar<'info, RentCopy> instead
+
+error: aborting due to previous error
+
diff --git a/lints/sysvar_address_check/ui/recommended/src/lib.rs b/lints/sysvar_address_check/ui/recommended/src/lib.rs
index 6491d94..098997a 100644
--- a/lints/sysvar_address_check/ui/recommended/src/lib.rs
+++ b/lints/sysvar_address_check/ui/recommended/src/lib.rs
@@ -16,3 +16,5 @@ pub mod recommended {
 pub struct CheckSysvarAddress<'info> {
     rent: Sysvar<'info, Rent>,
 }
+
+fn main() {}
diff --git a/lints/sysvar_address_check/ui/recommended/src/lib.stderr b/lints/sysvar_address_check/ui/recommended/src/lib.stderr
new file mode 100644
index 0000000..e69de29

From 61ee122a8a56eb13b80c2f835491ead9cb49c805 Mon Sep 17 00:00:00 2001
From: Victor Wei <vw1262@gmail.com>
Date: Wed, 3 Aug 2022 14:34:40 -0500
Subject: [PATCH 6/7] add readme

---
 lints/sysvar_address_check/README.md          | 63 +++++++++++++------
 lints/sysvar_address_check/src/lib.rs         | 57 +++++++++++++----
 .../ui/insecure-anchor/src/lib.rs             |  4 +-
 3 files changed, 92 insertions(+), 32 deletions(-)

diff --git a/lints/sysvar_address_check/README.md b/lints/sysvar_address_check/README.md
index 82b6f18..9271718 100644
--- a/lints/sysvar_address_check/README.md
+++ b/lints/sysvar_address_check/README.md
@@ -1,32 +1,59 @@
 # sysvar_address_check
 
-**What it does:**
-
-**Why is this bad?**
-
-**Known problems:** None.
+**What it does:** This lint checks to ensure that programs using Solana types that derive the
+`Sysvar` trait (e.g. Rent, Clock) check the address of the account. The recommended way to
+deal with these types is using the `from_account_info()` method from the `Sysvar` trait.
+This method performs the ID check and only deserializes from an `AccountInfo` if the check
+passes, and is thus secure.
+
+This lint catches direct calls to deserialize (via `bincode::deserialize`) a byte array into
+a type deriving Sysvar. Furthermore, if using the Anchor framework, this lint will catch
+uses of `Account<'info, T>`, where `T` derives `Sysvar`. This is insecure since Anchor
+will not perform the ID check in this case.
+
+**Why is this bad?** If a program deserializes an `AccountInfo.data` directly, without
+checking the ID first, a malicious user could pass in an `AccountInfo` with spoofed data
+and the same structure as a `Sysvar` type. Then the program would be dealing with incorrect
+data.
+
+**Known problems:** This lint will flag any calls to deserialize some bytes into a type deriving
+`Sysvar`, regardless of whether the ID check is done or not. Thus, if a program manually does the ID
+check and deserialization, the lint will still flag this as insecure, thus possibly generating
+some false positives. However, one should really prefer to use `from_account_info()`.
 
 **Example:**
 
 ```rust
-// example code where a warning is issued
+pub fn check_sysvar_address(ctx: Context<CheckSysvarAddress>) -> Result<()> {
+    let rent: Rent = bincode::deserialize(&ctx.accounts.rent.data.borrow()).unwrap();
+    msg!("Rent -> {}", rent.lamports_per_byte_year);
+    Ok(())
+}
 ```
 
 Use instead:
 
 ```rust
-// example code that does not raise a warning
+pub fn check_sysvar_address(ctx: Context<CheckSysvarAddress>) -> Result<()> {
+    let rent = Rent::from_account_info(&ctx.accounts.rent).unwrap();
+    msg!("Rent -> {}", rent.lamports_per_byte_year);
+    Ok(())
+}
 ```
 
+## Note on Tests
+
 **insecure-2:** an actual insecure example since it does deserialization without checking ID. Essentially what
-the sealevel-insecure example was trying to demonstrate
-**insecure-anchor:** an insecure example that more directly uses anchor, ie, uses Account<'info, T>, where T
-derives Sysvar. This doesn't do the ID check that the anchor Sysvar type does.
-**recommended:** the secure way to use anchor to check IDs. Directly fixes "insecure-anchor" by using Sysvar type.
-**secure-2:** Fixes "insecure-2" case. Uses the `from_account_info()` method, which performs the ID check.
-
-NOT TESTED:
-insecure: sealevel-example. not tested because it's technically not insecure, since it never attempts
-a deserialization
-secure: poor sealevel example. Does key check, but never deserializes, so technically the vulnerability is
-non-existent in this example.
\ No newline at end of file
+the sealevel insecure example was trying to demonstrate (see below).
+**secure-2:** Fixes the "insecure-2" case. Uses the `from_account_info()` method, which performs the ID check.
+**insecure-anchor:** an insecure example that uses `Account<'info, T>`, where `T`
+derives Sysvar. This doesn't do the ID check that the `anchor::Sysvar` type does.
+**recommended:** the secure way to use Anchor to check IDs. Directly fixes "insecure-anchor" by using
+the `anchor::Sysvar` type.
+
+### NOT TESTED:
+
+**insecure:** sealevel-example; not tested because it's technically not insecure as it never attempts
+a deserialization.
+**secure:** sealevel-example; oes key check, but never deserializes, so technically the vulnerability is
+non-existent in this example.
diff --git a/lints/sysvar_address_check/src/lib.rs b/lints/sysvar_address_check/src/lib.rs
index 2572bef..562251f 100644
--- a/lints/sysvar_address_check/src/lib.rs
+++ b/lints/sysvar_address_check/src/lib.rs
@@ -6,38 +6,65 @@ extern crate rustc_hir;
 extern crate rustc_middle;
 extern crate rustc_span;
 
-use rustc_hir::def::Res;
-use rustc_hir::intravisit::{walk_expr, FnKind, Visitor};
-use rustc_hir::{Body, Expr, ExprKind, FnDecl, HirId, FieldDef, TyKind as HirTyKind, GenericArg, QPath};
+use rustc_hir::{
+    def::Res,
+    intravisit::{walk_expr, FnKind, Visitor},
+    Body, Expr, ExprKind, FieldDef, FnDecl, GenericArg, HirId, QPath, TyKind as HirTyKind,
+};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty::TyKind;
 use rustc_span::Span;
 
 use clippy_utils::{
-    diagnostics::span_lint_and_help, get_trait_def_id, match_def_path, ty::{implements_trait, match_type}
+    diagnostics::span_lint_and_help,
+    get_trait_def_id, match_def_path,
+    ty::{implements_trait, match_type},
 };
 use if_chain::if_chain;
 use solana_lints::paths;
 
 dylint_linting::declare_late_lint! {
-    /// **What it does:**
+    /// **What it does:** This lint checks to ensure that programs using Solana types that derive the
+    /// `Sysvar` trait (e.g. Rent, Clock) check the address of the account. The recommended way to
+    /// deal with these types is using the `from_account_info()` method from the `Sysvar` trait.
+    /// This method performs the ID check and only deserializes from an `AccountInfo` if the check
+    /// passes, and is thus secure.
+
+    /// This lint catches direct calls to deserialize (via `bincode::deserialize`) a byte array into
+    /// a type deriving Sysvar. Furthermore, if using the Anchor framework, this lint will catch
+    /// uses of `Account<'info, T>`, where `T` derives `Sysvar`. This is insecure since Anchor
+    /// will not perform the ID check in this case.
     ///
-    /// **Why is this bad?**
+    /// **Why is this bad?** If a program deserializes an `AccountInfo.data` directly, without
+    /// checking the ID first, a malicious user could pass in an `AccountInfo` with spoofed data
+    /// and the same structure as a `Sysvar` type. Then the program would be dealing with incorrect
+    /// data.
     ///
-    /// **Known problems:** None.
+    /// **Known problems:** This lint will flag any calls to deserialize some bytes into a type deriving
+    /// `Sysvar`, regardless of whether the ID check is done or not. Thus, if a program manually does the ID
+    /// check and deserialization, the lint will still flag this as insecure, thus possibly generating
+    /// some false positives. However, one should really prefer to use `from_account_info()`.
     ///
     /// **Example:**
     ///
     /// ```rust
-    /// // example code where a warning is issued
+    /// pub fn check_sysvar_address(ctx: Context<CheckSysvarAddress>) -> Result<()> {
+    ///     let rent: Rent = bincode::deserialize(&ctx.accounts.rent.data.borrow()).unwrap();
+    ///     msg!("Rent -> {}", rent.lamports_per_byte_year);
+    ///     Ok(())
+    /// }
     /// ```
     /// Use instead:
     /// ```rust
-    /// // example code that does not raise a warning
+    /// pub fn check_sysvar_address(ctx: Context<CheckSysvarAddress>) -> Result<()> {
+    ///     let rent = Rent::from_account_info(&ctx.accounts.rent).unwrap();
+    ///     msg!("Rent -> {}", rent.lamports_per_byte_year);
+    ///     Ok(())
+    /// }
     /// ```
     pub SYSVAR_ADDRESS_CHECK,
     Warn,
-    "description goes here"
+    "missing address check for Sysvar types"
 }
 
 impl<'tcx> LateLintPass<'tcx> for SysvarAddressCheck {
@@ -69,9 +96,15 @@ impl<'tcx> LateLintPass<'tcx> for SysvarAddressCheck {
                     cx,
                     SYSVAR_ADDRESS_CHECK,
                     field.span,
-                    &format!("Anchor Account type T is '{}', which derives the Sysvar trait", account_type),
+                    &format!(
+                        "Anchor Account type T is '{}', which derives the Sysvar trait",
+                        account_type
+                    ),
                     None,
-                    &format!("Account type does not perform an ID check. Use Sysvar<'info, {}> instead", account_type),
+                    &format!(
+                        "Account type does not perform an ID check. Use Sysvar<'info, {}> instead",
+                        account_type
+                    ),
                 );
             }
         }
diff --git a/lints/sysvar_address_check/ui/insecure-anchor/src/lib.rs b/lints/sysvar_address_check/ui/insecure-anchor/src/lib.rs
index a07f08f..28549d9 100644
--- a/lints/sysvar_address_check/ui/insecure-anchor/src/lib.rs
+++ b/lints/sysvar_address_check/ui/insecure-anchor/src/lib.rs
@@ -1,7 +1,7 @@
 use anchor_lang::prelude::*;
-use solana_program::sysvar::SysvarId;
+use serde::{Deserialize, Serialize};
 use solana_program::pubkey;
-use serde::{Serialize, Deserialize};
+use solana_program::sysvar::SysvarId;
 
 declare_id!("Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS");
 

From bcdbfa954e91f5b680170d0a889bd632f5275b97 Mon Sep 17 00:00:00 2001
From: Victor Wei <vw1262@gmail.com>
Date: Wed, 3 Aug 2022 14:37:04 -0500
Subject: [PATCH 7/7] remove crate-local paths.rs

---
 lints/sysvar_address_check/src/paths.rs | 1 -
 1 file changed, 1 deletion(-)
 delete mode 100644 lints/sysvar_address_check/src/paths.rs

diff --git a/lints/sysvar_address_check/src/paths.rs b/lints/sysvar_address_check/src/paths.rs
deleted file mode 100644
index 8b13789..0000000
--- a/lints/sysvar_address_check/src/paths.rs
+++ /dev/null
@@ -1 +0,0 @@
-